This is the 609th most frequent Arabic word.
علينا
"علينا" means "upon us" or "on us."
Here, "علينا" emphasizes the collective responsibility to achieve the mentioned task.
يجب علينا أن نتعاون لإنجاز المشروع.
We must cooperate to complete the project.
In this context, "علينا" implies the necessity or action required due to the situation described.
إن المطر غزير، لذا علينا إحضار مظلة.
The rain is heavy, so we must bring an umbrella.
In this sentence, "علينا" is used to denote obligation or duty felt by the speaker and the group they are addressing.